Drill guide bushing



March 6, 1951 w. R. FISHER 2,543,840

' DRILL GUIDE BUSHING Filed March 4, 1949 ,2 |I||.l"" III"- In Fig-l A 7 I, I 3 I11! um 3 m |A 1 L I I I Patented Mar. 6, 1951 UNITED STATES,P. .\"ll?.I l'l OFFICE p 2,543,840 DRILL GUIDE BUSHING W. Reuen Fisher, Woodland, Mich. Application March 4, 1949, Serial No. 79,655 4 Claims. (01. 'i'7-62) My invention relates to a new and useful improvement in a drill guide bushing adapted for use in guiding drills, reamers, and similar tools when in use. These drill guide bushings are either mounted in a. liner bushing or in a jig plate, and when mounted in a jig plate the lie plate is provided with an opening. of sufficient size to snugly receive the guide bushing. When mounted in a liner bushing,'the liner bushing has a bore of sufficient size to snugly receive the guide bushing, and the liner bushing would then be mounted in a hole formed in a suitable support. With this type of bushing, it is customary to provide. a structure whereby the guide bushing may be easily removed and. replaced, so that when it becomes worn it maybe replaced with another bushing for properly guiding. the drill or other 7 tool which is inserted therein. It frequently becomes necessary also to remove the guide bushing and replace it with a guide bushing of a different guiding bore. In such types of structure, it is customary to mount, either on the liner bushin or on the jig plate, a locking mechanism whereby the guide bushing will be locked in position and securely held in position while in use. This involves the expense of mounting the locking mechanism in the liner bushing or the jig plate, and

it is an object of the present invention to provide K a guide bushing so constructed and arranged that the locking mechanism is carried by the guide bushing itself and adapted to cooperate with the inner face of the opening formed in the jig plate orthe inner surface of the liner bushing, depending upon which type with which it is used. An-

. other object of the invention is the provision of a guide bushing of this type having locking mechanism mounted thereon so arranged and constructed that the guide bushing may be easily rotated in one direction and the reverse rotation I that it may be economically manufactured, highly efficient in use, and easily and quickly placed in position and removed therefrom, and durable.

Other objects willappear hereinafter. i

It is recognized that various modifications and without departing from the invention, and such variations are intended to be contemplated herein.

Forming a part of this specification are drawings in which:

Fig. 1 is a longitudinal central sectional view of the invention, showing it mounted in position,

Fig. 2 is a sectional view taken on line 2-2 of Fig.1,

Fig. 3 is an enlarged sectional view taken 0 line 3-3 of Fig. 1,

Fig. 4 is a fragmentary enlarged sectional View taken on line 44 of Fig. 3,

Fig. 5 is an enlarged sectionalview' similar to Fig. 3, showing a slight modification,

Fig. 6 is an enlarged fragmentary sectional view 1 taken on line 6--6 of Fig. 5.

As shown in the drawings, the bushing comprises a cylindrical body I having the bore l9 formed therethrough, which serves to guide a drill, reamer, or a similar tool. Mounted on one endof the body I is a flange 8. In use, this body 1 is adapted for insertion into the bore 9 formed in a suitable supporting body l0.

Formed in the periphery of the body 1, in circ-umfere'ntial alignment, is a plurality of recesses having the face l3 which is extended chordally. This recess is also provided with the face II at the end, the recess being deeper at one end than the other, as clearly shown in Fig. 3. In addition to having the face l3 extended chordally, the face I3 also is inclined to the axis of the body 1, as clearly shown in Fig. 4. Intersectin these recesses is a peripheral groove [2, in which is positioned a retaining band It. This band [4 may be formed from resilient material and interrupted so that it may be sprung on to the. body I as to snap into the groove [2, or it may be placed in the groove [2 and the meeting edges then brazed or otherwise secured together to form an uninterrupted circular band It, as illustrated in Fig. 3. Formed in this band at each of therecesses is. a slot or opening I5, and in the form changes may be made in the detail of structure shown in Fig. 3 and Fig. 4, there is a roller [6 positioned so that the periphery of this roller will project outwardly throu h the openin [5 when the bushing body 1 is rotated in a reverse direction. By rotating the body I as shown in Fig. 3,

in a counterclockwise direction, the roller would have the tendency to ride into the part of the recess which is of less depth, and this would 3 terclockwise so that when the drill contacted the inner surface of the bore I9, it would have a tendency to lock the body I tighter in the supporting body It). It is believed obvious that a structed in this manner may be economically manufactured and is highly efficient in use, While at the same time it permits a rigid locking of the bushing against rotation by the drill or reamer or other tool which is being used, while at the same time a rotation in one direction will securely lock the bushing in the supporting body Whereas a reverse rotation will release the guide bushing for ready removal and replacement.

What I claim as new is:

1. A guide bushing of the class described, adapted for mounting in the bore of a supporting body, comprising a cylindrical body having a plurality of circumferentially aligned, spaced apart recesses formed in its periphery, said recesses, rotatively, being deeper at one end than the other, and said body having a peripheral groove extending around the same and intersecting said recesses; a retaining band mounted in said groove and having an opening formed at each of said recesses and of a thickness equal to the depth of said groove; and a rotatable locking member psitioned in each of said recesses and projecting at its periphery through said opening in said band for engaging the face of the supporting body in which mounted.

2. A guide bushing of the class described, adapted for mounting in the bore of a supportin body, comprising a cylindrical body having a plurality of circumferentially aligned, spaced apart recesses formed in its periphery, said recesses, rotatively, being deeper at one end than the other, and said body having a peripheral groove extending around the same and intersecting said recesses; a retaining band mounted in said groove and having an opening formed at each of said recesses and having its peripheral surface flush with the periphery of said body; and a rotatable lockin member positioned in each of said recesses and projecting at its periphery through said opening in said band for engaging the face of the supporting body in which mounted, said recesses 4 having their inner face inclined to the axis of said body.

3. A guide bushing of the class described, adapted for mounting in a supporting body having a bore formed therein, comprising a cylindrical body having a bore formed therethrough and adapted for seating in the bore of said supporting body in a snug fit, said cylindrical body having formed in its periphery a plurality of spaced apart, circumferentially aligned recesses, said recessesbeing, rotatively, deeper at one end than the other, the inner faces of said recesses bein inclined to the axis of said cylindrical body and said cylindrical body having a peripheral groove extending around the same and intersecting said recesses; a retaining band mounted in said groove and having an opening formed at each of said recesses and having its peripheral surface flush with the periphery of said body; and a rotatable locking member positioned in each of said recesses engaging said face inclined to the axis of said cylindrical body for resisting rotation of said cylindrical body relative to the supporting body in one direction and resisting axial movement of said cylindrical body relatively to said supporting body in one direction upon engagement of said locking members with the inner face of said supporting body.

4. A guide bushing of the class described, adapted for mounting in the bore of a supporting body, comprising; a cylindrical body having a recess formed in its periphery, said body having a peripheral groove extending around the same and intersecting said recess; a retaining band mounted in said groove and having an opening formed registering with the recess and having its peripheral surface flush with the periphery of said body; and a rotatable locking member positioned in said recess and projecting at its periphery through said opening in said band for engaging the face of a supporting body in which mounted.

W. REUEN FISHER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 717,296 Spalding Dec. 30, 1902 838,024 Hendricks Dec. 11, 1906 1,660,190 Fisher Feb. 21, 1928 1,706,847 Fisher Mar. 26, 1929 2,332,061 Conkle Oct. 19, 1943 

